8-thioureidomethyl ergoline derivatives

ABSTRACT

Ergoline derivatives having anti-stress activity, and a process for making them. The compounds are of the formula:   WHEREIN R is selected from the group consisting of hydrogen and methyl; R1 and R2 are selected from the group consisting of hydrogen, saturated or unsaturated lower alkyl, cycloalkyl, aryl and aralkyl; R1 and R2 together with the nitrogen atom to which they are attached may form a heterocyclic ring; X is selected from the group consisting of hydrogen and methoxy; the bond of the substituents in the 8- and 10-positions may be 8 Alpha -, 10 Beta - or 8 Beta -, 10 Alpha - respectively; except for R1 hydrogen and R2 methyl, butyl and allyl in the 8 Beta -, 10 Alpha -substituted compounds.

United States Patent 1 Arcari et a1.

[ 1 Feb. 20, 1973 [54] S-THIOUREIDOMETHYL ERGOLINE DERIVATIVES [73] Assignee: Societa Farmaceutici ltalia, Milan,

Italy [22] Filed: July 17, 1970 [21] Appl. N0.: 55,985

[30] Foreign Application Priority Data July 18,1969 Italy ..19791 A/69 [52] U.S. C1 ..260/285.5, 424/261 [51] Int. Cl. ..C07d 43/20 [58] Field of Search ..260/285.5; 424/261 [56] References Cited UNITED STATES PATENTS 3,251,846 5/1966 Semonsky ..260/285.5 3,557,118 1/1971 Archamone.. ...260/285.5 3,238,211 3/1966 Camerino ....260/285.5 3,245,997 3/1966 Yonan ..260/283.5

Primary Examiner--Donald G. Daus Attorney-Curt M. Avery, Arthur E. Wilfond, Herbert L. Lerner and Daniel J. Tick [57] ABSTRACT Ergoline derivatives having anti-stress activity, and a' process for making them. The compounds are of the formula:

wherein R is selected from the group consisting of hydrogen and methyl; R and R are selected from the group consisting of hydrogen, saturated or unsaturated lower alkyl, cycloalkyl, aryl and aralkyl; R and R together with the nitrogen atom to which they are attached may form a heterocyclic ring; X is selected from the group consisting of hydrogen and methoxy; the bond of the substituents in the 8- and lO-positions may be 801-, 10/3- or 8 3-, 10arespectively; except for R, hydrogen and R methyl, butyl and allyl in the 83-, IOa-substituted compounds.

19 Claims, No Drawings 8-THIOUREIDOMETHYL ERGOLINE DERIVATIVES The invention relates to ergoline derivatives which possess anti-stress activity and, particularly anti-ulcer activity. The ergoline derivatives according to the invention have the formula:

N (III) wherein R is a hydrogen atom or a methyl group; R, and R each are a hydrogen atom, a saturated or unsaturated lower alkyl, cycloalkyl, aryl or aralkyl group or R and R together with the nitrogen atom to which they are attached form a heterocyclic ring; X is a hydrogen atom or a methoxy group; the bond of the sub-stituents in the 8-, lO-positions are 801-, 1018- or 8B- 10aexcept that R is a hydrogen atom and R is a methyl, butyl or allyl group in 8B-, IOasubstituted compounds.

The invention includes a process for preparing these derivatives. The process comprises reacting an amine of the formula I as herein defined with thiophosgene in an organic solvent, such as dichloro-ethane or chloroform and condensing the resulting 8-thiocyanomethyl-derivative with an amine of the formula NHR,R wherein R and R, are as herein defined. The reaction with thiophosgene is preferably initially carried out in the cold, (from to C) and then completed in the warm (from 10 to 40C). The condensation is preferably carried out in an organic solvent, such as an alcohol or an ether, at the boiling temperature of the solvent. When the reaction is over, the product may be isolated and purified by extraction and crystallization. This may all be represented by the following scheme:

J N R (I) 1% (III) wherein X, R, R and R all have the above meanings. The 8-aminomethyl derivative of Formula I, the starting material for the process, can be prepared by reducing the corresponding 8-amido derivative with lithium and aluminum hydride, as described, for instance, in Camerino et al, U. S. Pat. No. 3,238,211.

The new ergoline derivatives of the invention have proved useful in therapy for preventing and treating the troubles or organic lesions provoked by every-day stress factors. The morbid causes of the lesions or of the troubles of the digestive system are particularly reduced. The derivatives of the invention show a low systemic toxicity and hardly any pharmacological action in other biological systems. They are inactive, for example, on the systemic pressure and do not show anticholinergic activity.

The activity of the derivatives of the invention has been determined on adult male rats which have been subjected simultaneously to two stressing factors; fasting and to four hours of complete immobilization and develop a considerable number of erosions or ulcers of the glandular part of the gastric mucous membrane (Bonfils et al. Therapie 1960, 15, 1096). The lesions are similar to those described in the man after acute physical and psychical trauma. The results obtained are in Table I and show that the derivatives possess a considerable anti-ulcer activity as they reduce, even at a dose of 1 mg/kg by subcutaneous route, the number of ulcers in comparison with the controls under the same experimental conditions.

TABLE I Inhibition of the Number of Ulcers in Comparison to the No. Compound Controls 1 SB-thioureidomethyl-fi-methyllOu-ergoline 86 2 83-[ 3ethyl-2-thioureido )-methyl l--methyllOa-ergoline I 59 3 8B-[( 3-isopropyl-2-thioureido)-rnethyl]-6- methyl- IOa-ergoline 36 4 8fl-[ 3-phenyl-2-thioureido )-methyl -6- methyl- 1 0aergoline 67 S 8B-[(3-benzyl-2-thioureido )-methyl]-6- methyll Oat-ergoline 53 6 8B-thioureidomethyl-l ,6-dimethyl- 10aergoline l5 7 Bar-thioureidomethyl-6-methyllOB-ergoline 20 8 8a-[ 3-methyl-2-thioureido )-methyl]-6- methyl-10B -ergoline 61 9 8a- 3-ethyl-2-thioureido )-methyl]-6-methyllOfi-ergoline 57 10 8a-[ 3-isopropyl-2-thioureido)-methyl ]-6- methyl- 1 Ofl-ergoline 7 l l 1 Su-[ 3-allyl-2-thioureido )-methyl]-6-methyllOB-ergoline 47 12 8a-[ 3-phenyl-2-thioureido )-methyl]-6- methyl- 1 0B-ergoline 74 I3 8a[(3-benzyl-2-thioureido)-methyl1-6- methyl- 1 Ofi-ergoline 17 The capacity of the derivatives of the invention for inhibiting the gastric secretion in the rat and in the hamster (Golden Hamster) has been evaluated. The gastric secretion of animals after fasting for 24 hours was collected four hours after ligature of the pylorus and subjected to chemico-physical analyses of the gastric secretion (Shay H., Gastroenterology 1945, 5, 43). The results are in Table II and show that the derivatives of the invention reduce at a dose of 10 mg/kg by subcutaneous route, both the quantity of the gastric secretion produced in four hours and the quantity of free hydrochloric acid present in the secretion.

TABLE II Rat Hamster (Goldern Hamster) Inhibition Inhibition of the of the volume of volume of gastric secregastric secre- Comtion in comtion in corn- Inhibipound parison to Inhibition parison to tion No. the controls free I-ICI the controls free BC] I 52 34 24 I7 2 l1 59 60 3 52 36 45 38 4 40 7 y 44 S 30 I7 8 44 33 39 9 40 21 44 46 I 15 l l 30 26 I 1 l I3 30 23 l2 38 21 40 I3 4l 21 The inhibition of the gastric secretion has been also tested on the rat having a chronic gastric fistula. (A. Lane et al, Amer. J. Physiol. i957, 190, 221). The animals have been maintained under examination for 4 hours. The inhibition of the secreted volume, of the free hydrochloric acid and of the total hydrochloric acid present in the secretion has been calculated in comparison to tests carried out previously on the same animals. Table III lists the results obtained at different doses of the compounds when administered subcutaneously.

The invention includes pharmaceutical compositions containing a derivative according to the invention in admixture with a therapeutically acceptable excipient.

The following Examples illustrate the invention.

EXAMPLE 1 Sa-Thioureidomethyl-6-methyll OB-ergoline One g of dihydroisolysergamide (II) was dissolved in [00 ml of anhydrous tetrahydrofuran and mixed with l g of lithium aluminum hydride. The mixture was refluxed for one hour, cooled and the excess of reagent was removed with 2 ml of water. After concentration to a small volume, the residue was taken up several times with warm chloroform and washed with water. The chloroform was evaporated off under vacuum. An amorphous residue was obtained, consisting of dihydroisolysergamine (II) (8a-amino-methyl-6- methyl-lQB-ergoline); [a] 20(c 0.5 in pyridine).

0.52 g. of thiophosgene and 1 g of this aminomethyl-6-methyl-lOfl-ergoline were added, at 0C with shaking, to a suspension of 0.6 g of calcium carbonate, 5 ml of dichloroethane and 7 ml of water. The mixture was mixed with 30 ml of chloroform, allowed to stand overnight, heated to 35C for 30 minutes, filtered and the chloroform layer was evaporated to dryness. A solid residue of 8a-thiocyanomethyl-6-methyl-l0B-ergoline was obtained. This residue was dissolved in 40 ml of methanol and mixed with 5 ml of 27 percent ammonium hydroxide. The product was refluxed for ten minutes and allowed to stand overnight. It was then evaporated under vacuum. Crystallization from methanoldiethyl ether yielded 8a-thioureidomethyl-6-methyl-[OB-ergoline melting at l73- l75C.

EXAMPLE 2 SB-Thioureidomethyl--methyl- IOa-ergoline Operating as in Example I, but employing as the starting material 8B-amino-methyl-6-methyl-lOa-ergoline (Gazzetta, I964, 94, 936) 8,6-thi0ureidomethyl- G-methyI-lOa-ergoline was obtained, melting at 224 226C.

EXAMPLE 3 fi-Thioureidomethyl-l ,6-dimethyl-1 Oa-ergoline Operating as in Example 1, but employing as the starting material SB-amino-methyl-l,G-dimethyl-lOaergoline, 8j3-thioureidomethyl-l ,o-dimethyll Oat-ergoline was obtained, melting at 139 l4 1 C.

EXAMPLE 4 8a-Thioureidomethyll ,6-dimethyll OB-ergoline Operating as in Example 1, but employing as the starting material 8a-amino-methyI-l ,6-dimethyl-l 0B- ergoline, 8a-thioureidomethyll ,-dimethyll OB-ergoline was obtained. I

EXAMPLE 5 Operating as in Example 1, but replacing ammonium hydroxide with the appropriate amine, there had been obtained:

8B-{(3-isopropyl-2-thioureido)-methyl]-6-methyllOa-ergoline m.p. 170- 172C 8B-[(3-ethyl-2-thioureido)-methyl]-6-methyl-10aergoline m.p. 165 167C 8B-[(3-phenyl-2-thioureido)-methyl]-6-methyl-10aergoline m.p. 229 230C 8B-[(3-benzyl-2-thioureido)-methyl]-6-methyl-10aergoline m.p. 20 1 203C 8a-[(3-methyl-2-thioureido)-methyl]-6-methyl-10B- ergoline m.p. 148- 150C 8a-[(3-ethyl-2-thioureido)-methyl]-6-methyl-10B- ergoline m.p. 136 138C 8a-[ 3-isopropyl-2-thioureido )-rnethyl]-6-methyll 0 B-ergoline m.p. 153 155C 8a-[( 3-allyl-2-thioureido )-methyl ]6-methyl- I OB-ergoline m.p. 126 128C 2 333 UNITED, STATES PATENT OFFICE CERTIFICATE OF CORRECIIGN Patent No. 3 711640 Dated Februarv 20 1973 Pietro Ulivi; lnven fl Giuliana Arcari; Gian Carlo Fregnan; Aldemio Temperilli'.

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, structural formula (III) 1 2 N-CH:

should read Column 2, line 24: "There-pie 1960, I5, 1096) should read Therapie 1960, l 5 1096) 0 Column 2, line 69: "Gastroenterology 1945, 5, 43) should read Gastroenterology 1945, Q, '43) Column 3, line 27: 'Physiol. 1957, 190, 221). should read Physiol. 1957, l 9 Q, 221). Column 4, line 36: (Gazzetta, 1964, 94, 936)" should read (Gazzetta, 1964, 2 1, 936) Column 5, line 10:

mg UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,717, 640 Dated February 20, 1973 Giuliana Arcari; v Inventor(s) Gian Carlo Gregnan; Aldemio Temperilli; Pietro Ulivi.

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

"methyl1-6-rnethyl m.p. 14o-144c" should read methyl]- 6-methyllO{3-ergoline m.p. l40-l44C Column 6, line 1 of claim 16: "8a--[ (3.3'" should read 8a-[ (3,3'-

Signed. and sealed this 12th day of February 1974.

(SEAL) Attest:

EDWARD M.PLETCHER,JR. C. MARSHALL DANN Attesting Officer Commissioner of Patents 

1. 8 Alpha -thioureidomethyl-6-methyl-10 Beta -ergoline.
 2. 8 Beta -thioureidomethyl-6-methyl-10 Alpha -ergoline.
 3. 8 Beta -thioureidomethyl-1,6-dimethyl-10 Alpha -ergoline.
 4. 8 Alpha -thioureiDomethyl-1,6-dimethyl-10 Beta -ergoline.
 5. 8 Beta -((3-ethyl-2-thioureido)-methyl)-6-methyl-10 Alpha -ergoline.
 6. 8 Beta -((3-isopropyl-2-thioureido)-methyl)-6-methyl-10 Alpha -ergoline.
 7. 8 Beta -((3-phenyl-2-thioureido)-methyl)-6-methyl-10 Alpha -ergoline.
 8. 8 Beta -((3-benzyl-2-thioureido)-methyl)-6-methyl-10 Alpha -ergoline.
 9. 8 Alpha -((3-methyl-2-thioureido)-methyl)-6-methyl-10 Beta -ergoline.
 10. 8 Alpha -((3-ethyl-2-thioureido)-methyl)-6-methyl-10 Beta -ergoline.
 11. 8 Alpha -((3-isopropyl-2-thioureido)-methyl)-6-methyl-10 Beta -ergoline.
 12. 8 Alpha -((3-allyl-2-thioureido)-methyl)-6-methyl-10 Beta -ergoline.
 13. 8 Alpha -((3-phenyl-2-thioureido)-methyl)-6-methyl-10 Beta -ergoline.
 14. 8 Alpha -((3-benzyl-2-thioureido)-methyl)-6-methyl-10 Beta -ergoline.
 15. 8 Alpha -((3-cyclohexyl-2-thioureido)-methyl)-6-methyl-10 Beta -ergoline.
 16. 8 Alpha -((3.3''-diethyl-2-thioureido)-methyl)-6-methyl-10 Beta -ergoline.
 17. 8 Alpha -((3,3''-cyclopentamethylene-2-thioureido)-methyl)-6-methyl-10 Beta -ergoline.
 18. 8 Beta -((3-ethyl-2-thioureido)-methyl)-6-methyl-10 Alpha -methoxyergoline. 